I'm having a weird problem with signs I spawn in with code: When running a command, I spawn a sign above the button I'm looking at:

var prefab = "assets/prefabs/deployable/signs/sign.pictureframe.landscape.prefab";
BaseEntity bSign = GameManager.server.CreateEntity(prefab, button.transform.position);
if (bSign == null) return;

bSign.SetParent(button);
bSign.transform.localPosition = new Vector3(0f, 1.5f, 0.05f);
bSign.Spawn();​

After spawning it in, I use the mod Sign Artist to load a picture from the internet on it:

SignArtist.Call("API_SkinSign", player, targetEntity, url, false);​

This all works perfectly fine. (Did require me to make the API functions in SignArtist private). 
However when I leave the sign and go for example to the other side of the map and back to the sign, sometimes one or more signs appear blank.
When I press my button again (the button adds the image), it tells me the image was placed successfully, but the sign stays empty. But... only for me.
At the same time I see a blank sign, other players do see the image. It feels completely random and related to the client: It's not always the same sign appearing blank, it's never really empty as other people might see it while you don't. 

- When leaving the sign and teleporting back, there is a big chance you see most of the signs without a problem. 
- If you don't see an image and reconnect, the image is visible

I have the feeling I'm missing something I have to do with the sign after spawning it. Something that happens after teleporting or connecting/waking up, but not when you walk towards a sign. Maybe it has to do with the distance from your spawn point to the sign? There are a few cases the closest signs were all visible, but signs further away (walking towards them) were not. Do I have to make it active or something? Or give it a flag to load the image when a player is nearby? Just guessing now, I'm out of options.

FYI: It's not the 'duplicate image' problem, all images are unique. They are also not gone, just not visible for all.

Thanks!

Maybe something to do with networking? Maybe try to send a network update to them, see if that fixes it.

Images going blank randomly is a normal problem with SignArtist, nothing you can do about it. You should be posting this message on the plugin forum anyway.

I tried sending network updates, but seems like it has no effect. I'm not really a pro with C# so maybe this is a noob question: To me it sounds like SendNetworkUpdate() is only happening once, is that correct? Shouldn't I in this case send the network update the moment a player comes close?

@Jim, I was considering that, but I think this has nothing to do with Sign Artist. I know about the problems occuring with that mod, but those signs are (as far as I know) empty for real. When you use the /sil command on those signs, the image appears and all acts normally.
In my case, the signs are not empty: Other poaple may be able to see the image. If it's empty for someone and he uses /sil on them, chat says it worked, but the sign itself stays empty for that player, until he teleports out and in again.

Well it seems like you know more about it than I do, but I just wanted to say that this is a common issue on my server as well.

Merged post

From what you're saying, it seems like something happening on the client side rather than server?

Yes sir, or actually, something is not happening on the client side.